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Modeling the Effect of Leakage Inductance in Switching Converter Power Processors

Publishing Venue

IBM

Related People

Kelkar, S: AUTHOR

Abstract

An effective technique for the simulation of switching converter power processors has been disclosed earlier [*] using analog models for the switching portions of the circuit. A technique that permits the modeling of leakage inductance effects is disclosed; this model can be used along with the analog models to improve simulation accuracy. The leakage inductance can have important effects on performance especially during transient response and under high line, max load conditions. The key contribution in this disclosure is a general technique that permits easy and accurate modeling of the effects of leakage inductance.

Country

United States

Language

English (United States)

This text was extracted from an ASCII text file.

This is the abbreviated version, containing approximately
52% of the total text.

Modeling the Effect of Leakage Inductance in Switching
Converter Power Processors

An effective
technique for the simulation of switching
converter power processors has been disclosed earlier [*] using
analog models for the switching portions of the circuit. A technique
that permits the modeling of leakage inductance effects is disclosed;
this model can be used along with the analog models to improve
simulation accuracy. The leakage inductance can have important
effects on performance especially during transient response and under
high line, max load conditions. The key
contribution in this
disclosure is a general technique that permits easy and accurate
modeling of the effects of leakage inductance.

Fig. 1 shows
the power stage of a typical full bridge topology
power processor. The power transformer
leakage inductance is
represented by the two inductances Ll in series with the output
diodes. It is to be noted that Ll could
also represent the sum of
the leakage and the snubber inductance, if one is used. The switches
in the power stage are turned on in sequence, and before the switch
is on, the voltage V' is zero and the diodes are each carrying half
the total load current. It is assumed
that the output inductor L is
large so that the current through it stays constant and equal to the
load current lload. When the power stage
switches are turned on, the
voltage V' increases to a value determined by the supply voltage and
the power transformer turns ratio. With
the polarity of V', as
shown, the diode at the bottom will turn off and the top diode will
then carry all of the load current lload.
The effect of the leakage
inductance Ll is to delay the transfer of current from the bottom
diode to the one at the top. The
transfer of current is symmetrical
with the bottom diode turning off every other cycle, while the top
diode turns off every cycle. It is only
necessary to model the
effect of one transfer due to the symmetry of the circuit action.

Delay in the
transfer of current results in the voltage V1 at
the inductor being phase delayed, as shown in Fig. 2. The amount of
dela...